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    Preparation of phosphoric acid
    1.
    发明授权
    Preparation of phosphoric acid 有权

    公开(公告)号：US11702338B2

    公开(公告)日：2023-07-18

    申请号：US16762751

    申请日：2018-11-09

    申请人： Coatex ,  OCP SA

    发明人： Driss Dhiba ,  Benoît Magny ,  Hamid Mazouz ,  Céline Methivier ,  Jacques Mongoin

    IPC分类号： C01B25/222 ,  C01B25/22 ,  C08F20/06 ,  C08K3/32

    CPC分类号： C01B25/222 ,  C01B25/22 ,  C08F20/06 ,  C08K2003/329

    摘要： The invention relates to a method for the industrial preparation of phosphoric acid from an aqueous suspension comprising water and particles of at least one phosphate material dispersed in the presence of at least one additive of the anionic polymer type. Phosphoric acid is obtained by treating this suspension with at least one strong acid. The polymer is obtained by polymerization reaction of at least one acid selected from acrylic acid, methacrylic acid and salts thereof.
    The invention relates to the use of this anionic polymer as well as the method for improving the rheology of the suspension and the hydrodynamics of the reaction medium in which the reactions for the manufacture of phosphoric acid take place.

    Treatment of phospho gypsum
    5.
    发明授权
    Treatment of phospho gypsum 失效
    磷石膏的处理

    公开(公告)号：US06620395B1

    公开(公告)日：2003-09-16

    申请号：US09830405

    申请日：2001-04-27

    申请人： Dirk Guustaaf Mantel

    发明人： Dirk Guustaaf Mantel

    IPC分类号： C01B2518

    CPC分类号： C01F11/468 ,  C01B25/22 ,  C04B22/144

    摘要： A process is provided for recovering phosphoric acid from phospho gypsum produced as a by-product in a phosphoric acid production process and having water soluble P2O5 bound in the crystal lattice thereof. The process includes a) forming a suspension of phospho gypsum in an aqueous medium; b) subjecting the suspension to ultrasonic waves under conditions suitable to shatter the phospho gypsum crystal lattice releasing the bound water soluble P2O5 into the aqueous medium to produce phosphoric acid and a depleted phospho gypsum; c) separating the phosphoric acid from the depleted phospho gypsum and recovering the separated phosphoric acid; and d) optionally further treating the depleted phospho gypsum in a step to further reduce the level of any remaining water soluble P2O5 present in the depleted phospho gypsum. The level of the water soluble P2O5 in the depleted phospho gypsum is reduced to about 0.01% by weight.

    摘要翻译： 提供了一种在磷酸生产过程中作为副产物生产的磷石膏从其晶格中结合的水溶性P2O5回收磷酸的方法。 该方法包括：a）在水性介质中形成磷石膏的悬浮液; b）在适于粉碎磷酸石膏晶格的条件下使悬浮液经受超声波，将结合的水溶性P2O5释放到水性介质中以产生磷酸和贫化的磷酸石膏; c）从贫化的磷酸石膏中分离磷酸并回收分离的磷酸; 和d）任选地在一个步骤中进一步处理贫化磷酸石膏，以进一步降低贫化磷酸石膏中存在的任何剩余的水溶性P2O5的水平。 贫磷酸石膏中的水溶性P2O5的水平降低至约0.01重量％。

    Recovery of calcium fluoride from phosphate operation waste water
    6.
    发明授权
    Recovery of calcium fluoride from phosphate operation waste water 失效
    从磷酸盐操作废水中回收氟化钙

    公开(公告)号：US4171342A

    公开(公告)日：1979-10-16

    申请号：US863085

    申请日：1977-12-22

    申请人： Ronald J. Hirko ,  Harold E. Mills

    发明人： Ronald J. Hirko ,  Harold E. Mills

    IPC分类号： A23K1/175 ,  C01B25/22 ,  C01B25/222 ,  C01B25/32 ,  C01F11/22 ,  C02F1/52 ,  C02F1/58 ,  C02F1/66

    CPC分类号： C02F1/66 ,  A23K20/26 ,  C01B25/22 ,  C01B25/222 ,  C01B25/328 ,  C01F11/22 ,  C02F1/5236 ,  C02F1/583 ,  C02F2101/105 ,  C02F2101/14 ,  C02F2103/34 ,  C02F2209/06 ,  Y10S210/906 ,  Y10S210/915

    摘要： Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate and/or calcium oxide in two stages to precipitate out the major part of the fluorine values from the waters as calcium fluoride. After removal of the calcium fluoride the filtrate is treated with calcium oxide to remove a substantial portion of the remaining fluorine values as calcium fluoride. After removal of these calcium fluoride solids, the filtrate is treated with another charge of calcium oxide to produce dicalcium phosphate (dical) which is separated from the aqueous phase. The aqueous phase is treated with an additional charge of calcium oxide to remove a substantial portion of the solids from the aqueous phase leaving waters that can be discharged as waste or recycled as process water.

    摘要翻译： 氟化钙是通过磷酸处理产生的池塘水，由碳酸钙和/或氧化钙分两个阶段处理池塘水，从而将大部分氟值从水中以氟化钙沉淀出来。 除去氟化钙后，用氧化钙处理滤液以除去大部分剩余氟值作为氟化钙。 在除去这些氟化钙固体后，将滤液用另一次加入氧化钙处理以产生与水相分离的磷酸二钙（dical）。 水相用额外的氧化钙处理以从水相中除去大部分固体，离开水，其可以作为废物排出或作为工艺用水再循环。

    Continuous process for the manufacture of phosphoric acid using process water
    7.
    发明授权
    Continuous process for the manufacture of phosphoric acid using process water 失效
    使用工艺用水制造磷酸的连续工艺

    公开(公告)号：US4075305A

    公开(公告)日：1978-02-21

    申请号：US738141

    申请日：1976-11-02

    申请人： Jean-Francois Gielly

    发明人： Jean-Francois Gielly

    IPC分类号： C01B25/222 ,  C01B25/22 ,  C01B25/16

    CPC分类号： C01B25/22

    摘要： A continuous procedure is disclosed for the wet-process manufacture of phosphoric acid in a reaction zone and continuously cooled by means of evaporation into air circulating at the surface of the reaction zone. The evaporated gases are scrubbed by using part of the water needed for the methodic washing of the calcium sulfate, whereby the solution obtained is collected and passed into the reaction zone in such a way as to cause the soluble gaseous products to return to the reaction medium, from which they are collected with strong acid, which constitutes production. The procedure gives rise to no liquid pollutants, particularly fluorine, and does not increase the amount of water consumed.

    摘要翻译： 公开了在反应区中湿法制造磷酸的连续方法，并通过蒸发连续冷却到在反应区的表面循环的空气中。 通过使用硫酸钙的方法洗涤所需的一部分水来洗涤蒸发的气体，由此将所得溶液收集并进入反应区，使可溶性气体产物返回到反应介质 ，用强酸收集，构成生产。 该程序不产生液体污染物，特别是氟，并且不会增加消耗的水量。

    Process for preparing phosphoric acid
    8.
    发明授权
    Process for preparing phosphoric acid 失效
    制备磷酸的方法

    公开(公告)号：US4071603A

    公开(公告)日：1978-01-31

    申请号：US709388

    申请日：1976-07-28

    申请人： Thomas Alan Williams

    发明人： Thomas Alan Williams

    IPC分类号： C01B25/22 ,  C01B25/16 ,  C01F11/46

    CPC分类号： C01B25/22

    摘要： In a process for preparing phosphoric acid by contact of sulphuric acid and phosphate rock with filtration of the gypsum slurry and recycle of the rest for contact with fresh rock, a fraction of the recycle slurry is treated with sulphuric acid to convert at least some of the gypsum to calcium sulphate hemihydrate and the slurry comprising hemihydrate is returned to contact the mixture of phosphate rock, phosphoric acid and recycle gypsum slurry. The process gives an easily filtered gypsum slurry with low phosphate losses in the gypsum filter cake.

    摘要翻译： 在通过硫酸和磷酸盐岩接触制备磷酸的过程中，过滤石膏浆料和再循环剩余部分与新鲜的岩石接触，一部分循环浆料用硫酸处理以将至少一些 返回石膏至硫酸钙半水合物，并且将包含半水合物的浆料返回以与磷酸盐岩，磷酸和再循环石膏浆料的混合物接触。 该方法在石膏滤饼中提供容易过滤的具有低磷酸盐损失的石膏浆料。

    Removal of dissolved organic matter from acidic aqueous solution
    9.
    发明授权
    Removal of dissolved organic matter from acidic aqueous solution 失效
    从酸性水溶液中去除溶解的有机物

    公开(公告)号：US4064220A

    公开(公告)日：1977-12-20

    申请号：US672812

    申请日：1976-04-01

    申请人： Alexander Alon

    发明人： Alexander Alon

    IPC分类号： C02F1/28 ,  B01J19/00 ,  B01J20/22 ,  C01B17/90 ,  C01B25/22 ,  C01B25/234 ,  C01B25/237 ,  C02F1/54 ,  C02F1/56 ,  C07B61/00 ,  C08G8/04 ,  C01B25/16

    CPC分类号： C08G8/04 ,  B01J20/22 ,  C01B17/905 ,  C01B25/22 ,  C01B25/234 ,  C02F1/54

    摘要： An aqueous solution of a mineral acid is freed of dissolved or colloidally dispersed organic matter by admixing to the solution an aldehyde or an aldehyde oligomer and a compound copolymerizable with an aldehyde, allowing a polymerization reaction to occur and separating the resulting polymer. The polymer that forms removes selectively from the solution the said organic matter and any suspended organic matter is also removed. The aldehyde and the compound copolymerizable therewith may be added in the form of a pre-condensate.

    摘要翻译： 无机酸的水溶液通过与醛或醛低聚物和可与醛共聚的化合物混合而溶解或胶体分散的有机物质，从而进行聚合反应并分离所得聚合物。 所形成的聚合物选择性地从溶液中除去所述有机物和任何悬浮的有机物也被除去。 醛和可与其共聚的化合物可以以预缩合物的形式加入。

    Method for manufacturing phosphoric acid and gypsum
    10.
    发明授权
    Method for manufacturing phosphoric acid and gypsum 失效
    磷酸和石膏的制造方法

    公开(公告)号：US4059674A

    公开(公告)日：1977-11-22

    申请号：US272788

    申请日：1972-07-18

    申请人： Edwin B. Lopker

    发明人： Edwin B. Lopker

    IPC分类号： C01B25/22 ,  C01F11/46 ,  C01F11/00 ,  C01B25/16 ,  C01F1/00

    CPC分类号： C01F11/46 ,  C01B25/22 ,  C01P2006/80

    摘要： A method of producing wet process phosphoric acid comprises reacting, in a reactor system, calcium phosphate rock particles with a mixture of recycled phosphoric and sulfuric acids, preferably supplemented with added fresh sulfuric acid, to form additional phosphoric acid and calcium sulfate dihydrate (gypsum). The reactor environment is controlled so as to avoid appreciable coating of the rock particles with calcium sulfate. A gypsum slurry is withdrawn and product phosphoric acid is separated therefrom and withdrawn from the process. The gypsum may be washed with a dilute sulfuric acid wash solution which is then added to the reactor. The gypsum is passed to a first recrystallizer wherein sulfuric acid is introduced, and the gypsum is recrystallized to hemihydrate. A slurry of the hemihydrate is passed to a second recrystallizer, wherein water obtained as described below is added and the hemihydrate is recrystallized to gypsum. The liquid component of the recrystallized gypsum slurry is separated therefrom and is employed as the above mentioned dilute sulfuric acid wash solution with, preferably, a portion being diverted to the first recrystallizer to control the solids content thereof. The recrystallized gypsum is washed with water, which is then added to the second recrystallizer as described above, and the washed gypsum is removed from the process as by-product.

    摘要翻译： 一种生产湿法磷酸的方法包括在反应器系统中使磷酸钙岩石颗粒与再循环的磷酸和硫酸的混合物反应，优选加入添加的新鲜硫酸，以形成另外的磷酸和硫酸钙二水合物（石膏） 。 控制反应器环境以避免用硫酸钙明显地涂覆岩石颗粒。 取出石膏浆料，并将产物磷酸从其中分离并从该方法中取出。 石膏可用稀硫酸洗涤溶液洗涤，然后将其加入到反应器中。 将石膏通入第一重结晶器，其中引入硫酸，将石膏重结晶至半水合物。 将半水合物的浆液通入第二重结晶器，其中加入如下所述获得的水，并将半水合物重结晶至石膏。 将再结晶石膏浆料的液体成分从其中分离出来，并用作上述稀硫酸洗涤溶液，优选将一部分转移到第一重结晶器中以控制其固体含量。 重结晶的石膏用水洗涤，然后如上所述加入到第二重结晶器中，将洗涤的石膏作为副产物从该方法中除去。